My compact darkroom was in a basement half-bathroom (sink & toilet)
. I had an L-shaped section of plywood hinged to the wall which when down became a darkroom enlarger table (Beseler 23CII) and darkroom sink that rested on the toilet tank+edge of sink and drained into the bathroom's sink.
Similar setup could work in your pictured room. Hinge the table/darkroom-sink to wall to right of the bathroom sink. When down, the L-shaped table/darkroom sink rests on the bathroom sink where it opens to drain into the bathroom sink. Edges of the L-shape are about 2 inch high wood except where it drains into bathroom sink. As suggested by previous poster, paint this L-shaped table/sink with epoxy or polyurethane or marine paint. Latched in up position you lose maybe 2 3/4" of width in the bathroom.
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